linework for curves

[Anonymous]

Hello, I am having trouble getting curves to come in to my linework in civil 3d 2011. I am using the codes of BC and EC to begin and end the curves as well as PC and PT for curves. The linework comes in fine for the straight line sections, but it gives an error saying it could not fit the curve on my curves and it draws straight line segments instead. Am I using the wrong codes for curves? Any help would be Appreciated!

Chris

[Anonymous]

check your tangent length (BC to PI and PI to EC) to insure you can truly fit the required curve.

T = R tan Δ/2

[rl_jackson]

Are you using/getting a OC (on curve) shot, if not you need to.

[peterfunkautodesk]

Right now Civil 3D doesn't contain rules for how to create curves from just the BC and EC shots. Assuming tangency and a BC and EC shot, a curve would need to be constructed based on one of the two points and a new BC/EC point that was calculated. This is because it would be impossible to shoot the points in the field (to 16 decimal places).

The best way to do this right now in Civil 3D would be to shoot the tangents and then add either the BC or EC point as a curve point. This will make a tangent curve that passes through the curve point (the "One Point Curve").

Cheers,

Peter Funk

Autodesk, Inc.

[Anonymous]

Thanks! I will give it a try!